Cylinder pressure indicating means



March 25, 1941. o. B. BOLEY CYLINDER PRESSURE INDICATING MEANS Filed March 7, 1958 I $1 2 x v 4 a I INVENTQR Patented Mar. 25, 1941 UNITED STATES PATENT OFFICE CYLINDER PRESSURE INDICATIN G MEANS Oriek B. Boley, Beaumont, Tex. 3

Application March 7, 1938, Serial No. 194,485

4 Claims. (01. 73-51) The object of the invention is to provide an the primary l ib of the transformer is connected appliance to be used in connection with engines, but through a switch 25, so that the circuit on whereby the cylinder pressure within the cylinthe primary may be open when the device is not der, during the power stroke at any predeterin use. A condenser 26 is connected between the 5 mined position of the piston, may be readily decontact arm 23 and the ground to avoid the dele- 5 termined, so that selected readings may be taken terious effects of sparking when the make and and a pressure curve plotted therefrom; to probreak is opened, as it will be when the rise 21 vide an appliance of the kind indicated which of the cam 28 passes the lug 29 on the contact provides for its use with a plurality of cylinders arm 23.

without the necessity for having to be set up for The cam 28 is formed as an element of a stub 10 use with each particular cylinder; and generally shaft 30 pinned or otherwise secured to a socket to provide a device or appliance of the kind indimember 3| which, by means of a set screw 32, is cated which is of simple form and susceptible of designed for mounting on the cam shaft 33 of cheap manufacture. the engine, so that the cam 28 will rotate in timed With this object in view, the invention conrelation with the cam shaft 33. The stub shaft 15 sists in a construction and combination of part 30 is surrounded with a flanged bushing 34 on of which a preferred embodiment is illustrated which the Plate 2| is mOImted, the pl 19 being in the accompanying drawing but to which th also mounted on the bushing with a friction invention is not to be restricted. Practical ap- Washer 35 int p d. between it and the Plate plication may dictate certain changes or alterthe p ate l9 abutting a nut 36 on the forward 20 ations and the right is claimed to m k any end of the bushing and the plate 2| abutting the which fall within the spirit of the invention. real lange of the latter.

Figure 1 is an elevational view showing the The plates l9 and 2| are normally relatively invention applied in operative position. stationary but the former is angula ly adjustable Figure 2 is a front elevational view of the inth respect to the latter and its adj P 25 vention. tion is maintained bythe friction washer 35. Figure 3 is a sectional view on the plane indi- The plate 2| s st ionary with resp t o t e at by th lin 3 3 of Figure 2, engine and to insure this is provided with an Although adapted for use on any form of enangular arm 31 by means of W c it ay be segine in which cylinder pressure at that particcured to the engine fram y Sc ews 38 a d 30 ular point is to be determined, the invention is in pp es formed in the frame. illustrated as applied to an internal combustion In the illustrated ent, t e device is engine and comprises a light l0, periodically endesig ed for use on a fo y r i e a d V ergized, which serves as a means for noting the the ion Plate 2| is divided o four q pressure on a pressure gage II, the gage b i rants indicated as A, B, C and D respectively, 35 connected to the cylinder [2 at the upper end of h q ran h vin t n d ree divisions the latter and the light being preferably in facing marked respectively 9 etc. relation to thegage and disposed within a hous- The plate I9 is of smaller size than the plate ing l3 which, if desired, may also house the high So that the markings on h latter at the 40 tension transformer l4, across the secondary I411 periphery may be readily visible for registration 40 of which the light is connected. The primary Mb with the indicator 39 marked on the plate IQ, of the transformer is connected in series with the movement of the plate l9 to any one of the the battery I5 and make and break l6, one terdivisions in a particular quadrant, indicating minal of the battery being grounded, as indithe position of the piston in the cylinder to 4 cated at ll, and one terminal of the make and which the particular quadrant is related. But break, preferably the fixed terminal, being movement of the plate I9 changes the position of grounded, as indicated at 13. the make and break l6 relative to the cam shaft,

The make and break is carried on an angularly so that with the plate H1 in a particular position, adjustable plate l9 which is provided with aradithe make and break is opened by the rise 21 on ally projecting handle 20, so that the plate may the cam 28 at the indicated position of the piston 50 be adjusted relative to the stationary plate 2|, in the particular cylinder under consideration.

The make and break comprises a stationary If the switch 25 be closed, as it will when a test contact 22 and a movable contact 23 in the form is being run, the opening of the make and break of a pivoted arm spring pressed into engagement will result in a decline of the magnetic field in l; with the fixed contact by a leaf spring 24 to which the primary Mb with the result that a current will be set up in the secondary Ma, thus causing the lamp Ill to be energized. The lamp I0 is designed to be a neon lamp or any other acceptable lamp with a minimum after glow.

In the particular cylinder under test, the pressure gage will be continually changing but the operator, having made the proper setting of the plate 19, will watch the gage and at the point where it is desired to measure the presure, the light wil be energized, so that the pressure at that instant can be noted on the gage. This can be checked up by taking several readings in any adjusted position. The plate I9 is then shifted to the next position and a reading similarly taken. From the series of readings thus made, the desired pressure curve may be plotted and similarly the curve for all cylinders by carrying out the series of operations for each cylinder by adjustment of the plate I9 in the several quadrants of the stationary plate 2|.

The invention having been described, what is claimed as new and useful is:

1. In a cylinderpressure indicating means wherein the cylinder under test is equipped with a pressure gage and a piston movable therein, the combination of a visual indicator, a circuit maker and breaker, and an energizing circuit containing the latter and the indicator, actuating means for the maker and breaker driven in timed relation with the engine piston, and a mounting for the maker and breaker adjustable to vary the point of actuation of the latter, the visual indicator being in the form of a light directed on the face of the gage.

2. In a cylinder pressure indicating means wherein the cylinder under test is equipped with a pressure gage and a piston movable therein, the combination of a visual indicator in the form of a light directed on the face of the pressure gage, a circuit maker and breaker, and an energizing circuit containing the latter and the indicator, actuating means for the maker and breaker driven in timed relation with the engine piston, and a mounting for the maker and breaker adjustable to vary the point of actuation of the latter, the said mounting comprising a pair of plates of which one is stationary with respect to the cylinder and the second angularly adjustable with respect to the first and bodily supporting the maker and breaker.

3. In a cylinder pressure indicating means wherein the cylinder under test is equipped with a pressure gage and a piston movable therein, the combination of a visual indicator in the form of a light directed on the face of the pressure gage, a circuit maker and breaker, and an energizing circuit containing the latter and the indicator, actuating means for the maker and breaker driven in timed relation with the engine piston, and a mounting for the maker and breaker adjustable to vary the point of actuation of the latter, the said mounting comprising a pair of plates of which one is stationary with respect to the cylinder and the second angularly adjustable with respect to the first and bodily supporting the maker and breaker, the two plates having a common mounting and a friction washer surrounding said mounting and interposed between them.

4. In a cylinder pressure indicating means wherein the cylinder under test is equipped with a pressure gage and a piston movable therein, the combination of a visual indicator in the form of a light directed on the face of the pressure gage, a circuit maker and breaker, and an energizing circuit containing the latter and the indi-- cator, actuating means for the maker and breaker driven in timed relation with the engine piston, and a mounting for the maker and breaker adjustable to vary the point of actuation of the latter, the said mounting comprising a pair of plates of which one is stationary with respect to the cylinder and the second angularly adjustable with respect to the first and bodily supporting the maker and breaker, the two plates having a common mounting and a friction washer surrounding said mounting and interposed between them, the stationary plate being marked off in angular units to correspond with the position of the cylinder piston and the adjustable plate having an indicator for selective registration with any of said markings.

ORICK B. BOLEY. 

